Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7bcd555755e2153…

MALICIOUS

PDF

71.3 KB Created: 2021-02-19 14:12:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 55a0580b04cecf9873205def7ebe1755 SHA-1: 9565582e7390779ba894567b958008f9a0624808 SHA-256: b7bcd555755e2153c241d08402145d1c16748faa70a153157e69048633a08639
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://maypoin.ru/strik?utm_term=how+to+adjust+chain+oiler+on+husqvarna+455+rancher PDF link annotation
    • https://gofolepoxi.weebly.com/uploads/1/3/4/8/134882907/2844741.pdfIn PDF document text
    • https://cdn.sqhk.co/wugunifikezu/hhhGm3z/tanusadezizuweniba.pdfIn PDF document text
    • https://zobegutibeg.weebly.com/uploads/1/3/4/9/134902349/xosuz.pdfIn PDF document text
    • http://probkin34.xyz/general_organic_and_biochemistry_7th_edition_test_bankhihhj.pdfIn PDF document text
    • http://xrootunited.com/the_grave_hoard_codedles7.pdfIn PDF document text
    • https://dodilepu.weebly.com/uploads/1/3/4/4/134444379/4608305.pdfIn PDF document text
    • http://kartaidatodemeleri.com/20326416905mhsoi.pdfIn PDF document text
    • https://varijiligedag.weebly.com/uploads/1/3/1/3/131383591/2833472.pdfIn PDF document text
    • https://lujoduxatodovaw.weebly.com/uploads/1/3/2/3/132302833/pesijote.pdfIn PDF document text
    • http://prechambre.xyz/876240505202evcx.pdfIn PDF document text
    • http://mon-cmbretagne.com/73850679218pwc9j.pdfIn PDF document text
    • http://fitit.space/86996177402lspq.pdfIn PDF document text
    • https://varijiligedag.weebly.com/uploads/1/3/1/3/131383591/f509791ef4066.pdfIn PDF document text
    • http://mifvideo.space/agneepath_song_musicbadshahtaenv.pdfIn PDF document text
    • https://jobovivubip.weebly.com/uploads/1/3/5/3/135392816/96aeba3ce0b8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/sokowubutazutoguz.pdfIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/vanilla_wafer_cookies_nutrition_information.pdfIn PDF document text
    • https://s3.amazonaws.com/lowebemuwojiso/bibetorojutu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB0D 5436 bytes
SHA-256: adf66173d50a91c0f224fdd382be1908003e4161cfc5030f23381d0af33399bf
font_01_sfnt_off0000dd9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9C 10320 bytes
SHA-256: 0f0cfef90e470f90beac9d0961d2ace33bc1ee519b3e0a417950e53dc49151c5
font_02_sfnt_off000100fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FC 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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